Nut-lock.



Thnad Lock, Gante@ Nm. .2

No. 724,196. PATENTED MAR. 31, 1903.

J. MARSHALL. i

NUT LOCK.

APPLIGATION FILED SEPT. 2o. 1902.

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@CEPT @tarima .TOI-IN MARSHALL, OF HARMONY, PENNSYLVANIA.

NUTWLCM.

SPECIFICATION forming part of Letters Latent No. 724,196, dated March31, 1903.

Application tiled September 20, 1902- Serial No. 124,147. (No model.)

'0 all whom it may concern:

Beit known that I, JOHN MARSHALL, a citian of the United States,residing at Harlony, in the county of Butler and State of ennsylvania,have invented a new and use- .il Improvement in Nut-Locks, of whichirnrovelnent the following is a speciiication.

This invention relates to certain new and seful improvements innut-locks; and the bject of the invention is to construct a deiceembodying an ordinarily-threaded bolt nd an ordinarily-threaded nut inwhich the ut after being tightly screwed up against Je object throughwhich the bolt is passed yill be securely held against displacement ntilleverage is applied to the nut to loosen he same.

Brieiiy described, my invention resides in he con struction of the nut,which is provided n its inner face with a beveled boss or fiangeXtending partially around the threaded aperure of the nut, the bevel ofthis boss or flange eing such that as the thicker portion theref wedgesagainst the face of the object hrough which the bolt is passed thethreads f the bolt and those of the nut are being ound in such a manneras to securely retain he nut against displacement until leverage sapplied thereto.

The detail construction of my invention will le hereinafter morespecifically described and hen particularly pointed out in the claim,and n describing the invention in detail reference rill be had to theaccompanying drawings, therein like numerals of reference will heemloyedfor designating like parts throughout he several views, in which- Figurelis a central vertical sectional view f my improved nut-lock, showingthe nut in he locked position. Fig. 2 is a plan view of he inside faceof the nut, and Fig. 3 is a cenral vertical sectional View of the nut.

In the accompanying drawings, l indicates he bolt, provided with theusual head 2 on ine end and having the threaded portion 3, vhile thenumeral 4 represents the objects hrough which the bolt is passed, thesebeing hown to clearly illustrate my invention.

`As stated, my invention resides in the pe- :uliar construction of thenut. This nut 5 is irovided with thethreads 7 for engagement Vith thethreads 3 of the bolt, and on its inier face this nut is provided with aboss or ange G, which extends about two-thirds of the way around thethreaded aperture of the nut, with the thickest portion 8 of the boss orflange about an equal distance from each end thereofand extending to apoint adjacent one end of the Harige or boss. This flange or boss tapersabruptly at one end to a meeting plane with the inner face of the nut,while from a point near the center to the other end of the boss or angethe same gradually tapers until the plane of the face is reached, asbest seen in Figs. 2 and 3 of the drawings. This boss or flange, it willbe observed, is threaded-that is, one thread of the nut terminates inthe boss or ange.

In operation the nut is threaded onto the bolt in the ordinary manneruntil the boss or flange engages the face of the adjacent part orelement 4. Then the Wrench is applied to the nut, the boss or iiangefrictionally engages the face of the part or element 4, as shown in Fig.1, and at this time the inner face of the nut below the bolt will befree from engagement with the part 4. The nut being thus engaged at oneside of the bolt and free at the other side thereof, the threads of thenut and those of the bolt are caused to frictionally engage, and as thepressure is increased the thread in the fiange or boss partially cantsor crosses that of the bolt, effectually locking the nut and preventingdisplacement thereof until the wrench is applied thereto.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

In a nut-lock, the combination with the threaded bolt, of a nut threadedon said bolt and provided on its inner face with a mutilated boss orflange having an interior thread, said boss or flange at one endtapering abruptly to the plane of the inner face of the nut and taperinggradually from a point about its center to the other end, substantiallyas described.

In testimony whereof I have hereunto signed my name in the presence oftwo subscribing witnesses. v

JOIIN MARSHALL.

In presence of Louis Monsun, U. S'rnvnns.

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